// 全局日期格式化
Date.prototype.Format = function(format){
	var o = {
		"M+" : this.getMonth()+1, //month
		"d+" : this.getDate(), //day
		"h+" : this.getHours(), //hour
		"m+" : this.getMinutes(), //minute
		"s+" : this.getSeconds(), //second
		"q+" : Math.floor((this.getMonth()+3)/3), //quarter
		"S" : this.getMilliseconds() //millisecond
	}
	if (/(y+)/.test(format)) {
		format = format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length))
	}
	for (var k in o) {
		if(new RegExp("("+ k +")").test(format)) {
			format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length))
		}
	}
	return format
}

// 获取文件名后缀名
String.prototype.extension = function(){
	var ext = null
	var name = this.toLowerCase()
	var i = name.lastIndexOf(".")
	if(i > -1){
		var ext = name.substring(i)
	}
	return ext
}

//判断Array中是否包含某个值
Array.prototype.contain = function(obj){
	for(var i=0; i<this.length; i++){
		if(this[i] === obj)
			return true
	}
	return false
}